3.1.17 Voltage Swell Threshold
For each half cycle of the fundamental period, VxRMS is calculated, per phase, and compared to the value set in SWELL_THRESHOLD_Vx: where x = [A, B, C], to determine if a voltage swell condition exists. For each half cycle that a voltage swell exists, the associated flag, SWELL_DET_Vx is set to 1.
A threshold is allowed for each phase and is computed using the native phase voltages before transformation to implied 4WY service. This allows setting different thresholds for non-balanced service types.
SWELL_THRESHOLD_Vx is stored in uQ0.32 format. So, set the threshold value as follows:
| Name: | SWELL_THRESHOLD_Vx |
| Offset: | Metrology_Reg_In[18-20] |
| Property: | Read-Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| SWELL_THRESHOLD_Vx[31:24] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | |||||||||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| SWELL_THRESHOLD_Vx[23:16] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | |||||||||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| SWELL_THRESHOLD_Vx[15:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | |||||||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| SWELL_THRESHOLD_Vx[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | |||||||||